\begin{table}[H]
\centering
\resizebox{\linewidth}{!}{
\begin{tabular}[t]{lcccc}
\toprule
\multicolumn{1}{c}{ } & \multicolumn{2}{c}{All treatment groups vs. placebo} & \multicolumn{2}{c}{Individual treatments vs. placebo} \\
\cmidrule(l{3pt}r{3pt}){2-3} \cmidrule(l{3pt}r{3pt}){4-5}
\cellcolor[HTML]{D3D3D3}{Constant} & \cellcolor[HTML]{D3D3D3}{\num{0.0005}} & \cellcolor[HTML]{D3D3D3}{\num{0.0005}} & \cellcolor[HTML]{D3D3D3}{\num{0.0005}} & \cellcolor[HTML]{D3D3D3}{\num{0.0005}}\\
 & (\num{0.0005}) & (\num{0.0013}) & (\num{0.0005}) & (\num{0.0013})\\
 & {}[\num{-0.0005}, \num{0.0015}] & {}[\num{-0.0021}, \num{0.0031}] & {}[\num{-0.0005}, \num{0.0015}] & {}[\num{-0.0022}, \num{0.0031}]\\
\cellcolor[HTML]{D3D3D3}{Treated} & \cellcolor[HTML]{D3D3D3}{\num{0.0020}**} & \cellcolor[HTML]{D3D3D3}{\num{0.0020}**} & \cellcolor[HTML]{D3D3D3}{} & \cellcolor[HTML]{D3D3D3}{}\\
 & (\num{0.0006}) & (\num{0.0006}) &  & \\
 & {}[\num{0.0008}, \num{0.0032}] & {}[\num{0.0007}, \num{0.0032}] &  & \\
\cellcolor[HTML]{D3D3D3}{Instructions-only treatment} & \cellcolor[HTML]{D3D3D3}{} & \cellcolor[HTML]{D3D3D3}{} & \cellcolor[HTML]{D3D3D3}{\num{0.0012}} & \cellcolor[HTML]{D3D3D3}{\num{0.0011}}\\
 &  &  & (\num{0.0007}) & (\num{0.0007})\\
 &  &  & {}[\num{-0.0003}, \num{0.0026}] & {}[\num{-0.0003}, \num{0.0026}]\\
\cellcolor[HTML]{D3D3D3}{Economic cost treatment} & \cellcolor[HTML]{D3D3D3}{} & \cellcolor[HTML]{D3D3D3}{} & \cellcolor[HTML]{D3D3D3}{\num{0.0021}*} & \cellcolor[HTML]{D3D3D3}{\num{0.0021}*}\\
 &  &  & (\num{0.0008}) & (\num{0.0009})\\
 &  &  & {}[\num{0.0004}, \num{0.0038}] & {}[\num{0.0004}, \num{0.0038}]\\
\cellcolor[HTML]{D3D3D3}{Costly abstention treatment} & \cellcolor[HTML]{D3D3D3}{} & \cellcolor[HTML]{D3D3D3}{} & \cellcolor[HTML]{D3D3D3}{\num{0.0026}**} & \cellcolor[HTML]{D3D3D3}{\num{0.0027}**}\\
 &  &  & (\num{0.0009}) & (\num{0.0009})\\
 &  &  & {}[\num{0.0009}, \num{0.0044}] & {}[\num{0.0009}, \num{0.0044}]\\
\midrule
Covariate adjustment: & Yes & No & Yes & No\\
Num.Obs. & \num{19951} & \num{19951} & \num{19951} & \num{19951}\\
\bottomrule
\multicolumn{5}{l}{\rule{0pt}{1em}+ p $<$ 0.1, * p $<$ 0.05, ** p $<$ 0.01, *** p $<$ 0.001}\\
\multicolumn{5}{l}{\rule{0pt}{1em}Notes: Standard errors clustered at the address level in parentheses. 95 percent confidence intervals in brackets.}\\
\end{tabular}}
\end{table}
